package com.fly.controller;

import com.fly.constants.StatusConstants;
import com.fly.repository.impl.InMemoryChatHistoryRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.ai.chat.client.ChatClient;
import org.springframework.ai.chat.memory.ChatMemory;
import org.springframework.ai.content.Media;
import org.springframework.util.MimeType;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import reactor.core.publisher.Flux;

import java.util.List;
import java.util.Objects;

@RequiredArgsConstructor
@RestController
@RequestMapping("/ai")
public class AiChatController {

    private final ChatClient chatClient;

    private final InMemoryChatHistoryRepository chatHistoryRepository;

    @PostMapping(value = "/chat", produces = "text/html;charset=utf-8")
    public Flux<String> chat(
            @RequestParam("prompt") String prompt,
            @RequestParam("chatId") String chatId,
            @RequestParam(value = "files", required = false) List<MultipartFile> files) {
        // 存储会话id
        chatHistoryRepository.save(StatusConstants.TYPE_CHAT, chatId);
        // 请求模型
        if (files == null || files.isEmpty()) {
            // 没有附件，纯文本
            return textChat(prompt, chatId);
        } else {
            // 有附件，多模态聊天
            return multiModelChat(prompt, chatId, files);
        }

    }

    private Flux<String> multiModelChat(String prompt, String chatId, List<MultipartFile> files) {
        // 解析多媒体
        List<Media> list = files.stream().map(file -> new Media(
                MimeType.valueOf(Objects.requireNonNull(file.getContentType())),
                file.getResource()
        )).toList();
        // 请求模型
        return chatClient
                .prompt(prompt)
                .user(p -> p.text(prompt).media(list.toArray(Media[]::new)))
                .advisors(a -> a.param(ChatMemory.CONVERSATION_ID, chatId))
                .stream()
                .content();
    }

    private Flux<String> textChat(String prompt, String chatId) {
        return chatClient
                .prompt(prompt)
                .advisors(a -> a.param(ChatMemory.CONVERSATION_ID, chatId))
                .stream()
                .content();
    }

}
